Get country from IP address (Java)

package hello.java.net;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressLookUpMain {

 // see http://cc.wariate.jp/
 static String baseHost = "cc.wariate.jp";

 static String[] locales = "JP,US,KR,CH,HK".split(",");

 public static String getCountry(String s) throws UnknownHostException {

 InetAddress inetAddr = InetAddress.getByName(s); // throws
 // UnknownHostException

 byte[] byteAddr = inetAddr.getAddress();

 StringBuffer sb = new StringBuffer();

 for (int i = (byteAddr.length - 1); i >= 0; i--) {
 int unsignedByte = byteAddr[i] < 0 ? byteAddr[i] + 256
 : byteAddr[i];
 sb.append(unsignedByte + ".");
 }

 for (int n = 0; n < locales.length; n++) {

 String country = locales[n];

 String lookupHost = sb.toString() + country.toLowerCase() + "."
 + baseHost;

 try {
 InetAddress.getByName(lookupHost);
 return (locales[n]);
 } catch (UnknownHostException e) {
 // e.printStackTrace();
 }

 }

 return null;
 }

 public static void main(String[] args) throws Exception {
 System.out.println(getCountry("www.yahoo.co.jp"));
 System.out.println(getCountry("www.ibm.com"));
 System.out.println(getCountry("daum.net"));
 System.out.println(getCountry("weibo.com"));
 System.out.println(getCountry("aho"));
 }
}

JP
US
KR
HK
Exception in thread "main" java.net.UnknownHostException: aho: aho
 at java.net.InetAddress.getAllByName0(InetAddress.java:1270)
 at java.net.InetAddress.getAllByName(InetAddress.java:1197)
 at java.net.InetAddress.getAllByName(InetAddress.java:1119)
 at java.net.InetAddress.getByName(InetAddress.java:1069)
 at hello.java.net.InetAddressLookUpMain.getLocale(InetAddressLookUpMain.java:14)
 at hello.java.net.InetAddressLookUpMain.main(InetAddressLookUpMain.java:55)

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